Your photos look to be a receiver reweld job. Aimsurplus is selling the semi versions also but they state it is built on a new US reciever. From the photos on AIMsurplus site, it looks like the receiver is stamped Wiselite. Are there two different versions of this semi build?

all these guns are from century and built by wise lite on rewelded receivers. I have a couple of kits and hopefully some day will get arounf to building one as a post sample and the other as a spare semi.

I spent about 5 hours polishing and blasting the gun, and now it is worthy of a place in my gun room, and looks like a $4.500.00 gun I polished the top cover and some other parts and blasted the receiver first with #80 alox to help blend the welds and grind marks then again with glass beads to produce a nice smooth matt finish. then it soaked for 30 minutes in a caustic cleaner then rinse and another 30 minutes in the hot salt bath to produce the nice jet black finish.